import React, { Component } from 'react'
//引入action
import {
  createIncrementAction,
  createDecrementAction,
  createIncrementAsyncAction
} from '../redux/count_action'
//引入connect用于连接UI组件与redux
import { connect } from 'react-redux'

//定义UI组件
class Count extends Component {

  state = { carName: '奔驰c63' }

  //加法
  increment = () => {
    const { value } = this.selectNumber
    this.props.jia(value * 1)
  }
  //减法
  decrement = () => {
    const { value } = this.selectNumber
    this.props.jian(value * 1)
  }
  //奇数再加
  incrementIfOdd = () => {
    const { value } = this.selectNumber
    if (this.props.count % 2 !== 0) {
      this.props.jia(value * 1)
    }
  }
  //异步加
  incrementAsync = () => {
    const { value } = this.selectNumber
    this.props.jiaAsync(value * 1, 800)
  }

  render() {
    //console.log('UI组件接收到的props是',this.props);
    return (
      <div>
        <h1>当前求和为：{this.props.count}</h1>
        <select ref={c => this.selectNumber = c}>
          <option value="1">1</option>
          <option value="2">2</option>
          <option value="3">3</option>
        </select>&nbsp;
        <button onClick={this.increment}>+</button>&nbsp;
        <button onClick={this.decrement}>-</button>&nbsp;
        <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
        <button onClick={this.incrementAsync}>异步加</button>&nbsp;
      </div>
    )
  }
}

//使用connect()()创建并暴露一个Count的容器组件
export default connect(
  state => ({ count: state }),

  //mapDispatchToProps的一般写法

  /* dispatch => ({
    jia:number => dispatch(createIncrementAction(number)),
    jian:number => dispatch(createDecrementAction(number)),
    jiaAsync:(number,time) => dispatch(createIncrementAsyncAction(number,time)),
  }) */

  //mapDispatchToProps的简写
  {
    jia: createIncrementAction,
    jian: createDecrementAction,
    jiaAsync: createIncrementAsyncAction,
  }
)(Count)

